JP2005110464A - Stator core for motor and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a motor having proper productivity, in which a wire rod can be accurately wound around and which has superior electrical characteristics, by preventing the deviation of a laminated core. <P>SOLUTION: The stator core is provided with respective T-shaped stator teeth, on which the wire rod such as a copper wire is wound, and respective core backs which are formed continuously and integrally to the T-shaped lower parts of the respective stator teeth, respectively and form a magnetic flux path of the wire rod. An assembly groove part is provided to the outer peripheral side end face of the core back so as to decide the horizontal and vertical positions of the stator teeth. The assembly groove part has the function as winding reference of the wire rod or lamination reference of the core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stator core for an electric motor and a method for manufacturing the same.

  In a conventional stator core of an electric motor, a plurality of magnetic pole pieces having a back yoke (core back) and teeth projecting from the back yoke are connected to each other via a joint formed on the back yoke. In the motor fixed iron core formed in an annular shape by bending the joint portion of the connecting iron core after winding, the notch portion is provided in the axial direction at a position facing the teeth portion on the outer periphery of the back yoke, and the iron core is annular The vibration and noise during operation are suppressed by relieving the compressive stress at the time of forming the film, press-fitting or shrink-fitting (see, for example, Patent Document 1).

JP 2001-238376 A (see page 4, FIG. 7)

  In a conventional stator core of an electric motor, although it is possible to relieve compressive stress when forming an iron core in an annular shape, press-fitting or shrink-fitting, it is not possible to wind a wire accurately, or a laminated core shift or core floating occurs. As a result, assembly troubles occur and electrical characteristics deteriorate.

The present invention has been made to solve the above-mentioned problems, and can accurately wind the wiring, prevent the laminated core from shifting and the core floating due to it, has good electrical characteristics, and has no assembly trouble. In particular, an object is to obtain an electric motor stator core with improved productivity of a split core structure.
Moreover, it aims at providing the manufacturing method with the sufficient productivity.

  Further, the present invention provides a method for manufacturing a stator core of an electric motor with high productivity in a stator core of an electric motor having a split core structure. .

  In the stator core of the electric motor according to the present invention, each of the T-shaped stator teeth around which a wire material such as a copper wire is wound, and the T-shaped lower portion of each of the stator teeth, are integrally formed continuously. In the status core having each core back that forms a magnetic flux path, an assembly groove is provided on the outer side end surface of the core back so as to determine the horizontal and vertical positions of the stator teeth, It has a function as a winding reference or a lamination reference of the core.

  Further, both sides of the assembly groove portion are provided so as to spread from the outer side end surface of the core back toward the stator teeth, and have a function of chucking the core back.

  Further, the assembly groove portion has a trapezoidal shape, and both ends of the assembly groove portion are formed such that the upper base of the trapezoid is positioned on the outer peripheral side end surface of the core back.

  In addition, an angle relaxation side is provided at the tip of both sides of the assembly groove, and the angle formed by the outer peripheral side end surface of the core back and the both sides is relaxed.

  Further, in the case where the assembly groove portion has a trapezoidal shape, the angle relaxation side is formed by a straight side substantially perpendicular to the upper base of the trapezoid.

  In addition, the tip of the angle relaxation side or the tip of both sides of the assembly groove is rounded.

  Further, the assembly groove portion is configured to have an obtuse angle.

  Further, each core back has a divided structure, and a hinge portion is provided on each core back, and the core back is bent by each hinge back adjacent to each other.

  Each of the T-shaped stator teeth on which a wire such as a copper wire is wound, and each of the T-shaped lower portions of each of the stator teeth is continuously and integrally formed with each core back. In the stator core divided into a plurality of parts along the annular direction, an overhang shape is formed on the outer peripheral side end face of the core back while punching each T-shaped stator tooth from the band-shaped silicon steel sheet. And the assembly groove part which functions as the winding reference | standard of the said wire, or the lamination | stacking reference | standard of the said core is processed.

  Each of the T-shaped stator teeth on which a wire such as a copper wire is wound, and each of the T-shaped lower portions of each of the stator teeth is continuously and integrally formed with each core back. In the stator core divided into a plurality of backs along the annular direction, the outer peripheral side end surface and the overhanging shape are formed continuously with the outer peripheral side end surface of the core back while punching each T-shaped stator tooth from the band-shaped silicon steel plate. A step of machining an assembly groove that functions as a winding reference for the wire or a lamination reference for the core, and an angle of the overhang formed by the outer peripheral side end surface of the core back and both sides of the assembly groove And a step of processing the angle relaxation side.

  As described above, in the stator core of the electric motor according to the present invention, each of the T-shaped stator teeth around which a wire such as a copper wire is wound, and the T-shaped lower portion of each of the stator teeth are continuously integrated. Each of the core backs forming the magnetic flux path of the wire rod, and an assembly groove portion is provided on the outer end surface of the core back so as to determine the horizontal and vertical positions of the stator teeth. Since it has a function as a winding reference of the wire or a stacking reference of the core, the wire can be wound accurately, and the laminated core can be prevented from being misaligned and solenor “core floating can be prevented. An electric motor stator core with reduced assembly trouble and improved productivity can be obtained.

  Since both sides of the assembly groove portion are provided so as to spread from the outer side end surface of the core back toward the stator teeth, and have the chucking function of the core back, production and assembly can be performed with high accuracy. Thus, a stator core for an electric motor with improved productivity and assembly can be obtained.

  In addition, since the assembly groove portion has a trapezoidal shape and both ends of the assembly groove portion are formed so that the upper base of the trapezoid is located on the outer peripheral side end surface of the core back, the chucking shape function can be easily performed. Therefore, an inexpensive stator core for an electric motor with improved productivity can be obtained.

  4. The stator core for an electric motor according to claim 3, wherein an angle relaxation side is provided at a tip portion of both sides of the assembly groove portion to relax an angle formed by an outer peripheral side end surface of the core back and the both sides. .

  Further, in the case where the assembly groove portion has a trapezoidal shape, the angle relaxation side is formed by a straight side substantially perpendicular to the upper base of the trapezoid, so that the mold can be easily worn and chipped. Therefore, a stator core for an electric motor with a low mold cost can be obtained.

  In addition, since the tip of the angle relaxation side or the tip of both sides of the assembly groove is rounded, a stator core for an electric motor having a longer mold life can be obtained.

  Further, since the inner angle of the assembly groove is formed to be an obtuse angle, the stator core of the motor having a longer mold life.

  Further, each core back has a structure in which each core back is divided, and a hinge portion is provided on each core back, and the core portion is bent by each hinge back adjacent to each other. In order to facilitate the winding work of the structure, a stator core of an electric motor with better winding assembly can be obtained. .

  Each of the T-shaped stator teeth on which a wire such as a copper wire is wound, and each of the T-shaped lower portions of each of the stator teeth is continuously and integrally formed with each core back. In the stator core divided into a plurality of parts along the annular direction, an overhang shape is formed with the outer peripheral side end surface connected to the outer peripheral side end surface of the core back while punching each T-shaped stator tooth from the band-shaped silicon steel plate. And since the assembly groove part which functions as the winding reference | standard of the said wire, or the lamination | stacking reference | standard of the said core is processed, the manufacturing method of the stator core of the electric motor of the split core structure with good productivity and assemblability is obtained.

  Further, in the stator core in which each tooth and each core back are divided into a plurality along the annular direction, the outer peripheral side end surface is connected to the outer peripheral side end surface of the core back while punching each T-shaped stator tooth from the band-shaped silicon steel plate. Forming an overhang shape and processing an assembly groove portion functioning as a winding reference of the wire rod or a stacking reference of the core; and the over-over formed by the outer peripheral side end surface of the core back and both sides of the assembly groove portion And a step of machining the angle relaxation side for relaxing the angle of the hang shape, so that a method for manufacturing a stator core of an electric motor having a split core structure with good productivity while preventing chipping and wear of the mold can be obtained.

Embodiment 1
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is a schematic plan view of the integral motor stator core, FIG. 2 is a schematic plan view of the split motor stator core, and FIG. 3 is a schematic cross-sectional partial view of the stator core after the wire material is wound around the motor stator teeth. These are schematic groove shape figures of the various assembly groove parts of a stator core back.
In these drawings, 1 is an annular stator core, 2 is a slot portion for accommodating the winding of the annular stator core 1, 3 is a magnetic pole side made of silicon steel plate or the like of the stator core 1, and 3a is a part of the magnetic pole side 3. Each of the T-shaped stator teeth portions, which are configured and wound with a wire such as a copper wire, has a gap separating the magnetic poles between the teeth portions 3a. 3b is continuously formed integrally with each of the T-shaped lower portions of the teeth portions 3a, and each core back portion forming a magnetic flux path is provided on the outer peripheral side end surface of the core back portion 3b. A trapezoidal assembly groove portion 5 functioning as a winding reference or stacking reference of the portion 3a is a wire such as a copper wire wound around the stator teeth portion 3a.

As shown in FIG. 1, the both sides 4a of the trapezoidal assembly groove part have a structure for determining the horizontal and vertical positions of the stator teeth 3a via the core back 3b, that is, from the core back part 3b to the stator teeth. The structure is inclined with respect to the axis of the stator core 1 so as to expand toward 3a.
Moreover, the trapezoidal assembly groove portion 4 is formed so that its upper base is positioned on the outer peripheral side end surface of the core back portion 3b, and is formed by both sides 4a of the assembly groove portion 4 and the outer peripheral side end surface of the core back portion 3b. An overhang portion 6 is formed, and the core back portion 3b can be chucked by both sides 4a constituting the overhang portion 6.

In addition, as shown in FIG. 2, reference numeral 7 denotes each hinge portion that connects the core back portions when each core back portion 3b is divided corresponding to each tooth portion 3a. A core back part 3b as a single part is formed with a concave part or a convex part, and the concave part or the convex part is fitted in the stacking direction so that the adjacent core back parts 3b are rotatably connected.
That is, the hinge portion 7 is provided only in the split stator core in which the annular stator core 1 is completed by bending each core back 3 b via the hinge portion 7.

Next, the assembly operation thus configured will be described with reference to FIGS.
First, after the stator core 1 is processed as will be described later, as shown in FIG. 9, the stator core 1 is put into a laminated assembly mold of a stator core having a laminated reference groove portion that is substantially the same shape as the assembled groove portion 4 as a laminated reference. Lamination is performed via the lamination reference groove.

  Next, when the stacking thickness of the stator core 1 reaches a predetermined thickness, the stack is removed from the stacking assembly mold and moved to the next winding assembly process, as shown in FIG. Is inserted into and fixed to a claw jig having a trapezoidal claw part that is substantially the same as the assembly groove part 4, so that the horizontal and vertical positions of the stator teeth 3 a are determined and fixed to the claw-like jig. .

  At this time, the claw-shaped jig is divided into left and right, and when a load is applied to each of the divided claw-shaped jigs as shown in the figure, there is no backlash between the claw-shaped jig and the assembly groove portion 4, The position accuracy in the horizontal direction and the vertical direction of the core back 3b is improved, and the claw-like jigs as a positioning mechanism can be concentrated on the outer peripheral side of the core back 3b, and a large space is secured on the tip side of the teeth 3a. Therefore, the arrangement of the mechanism for turning the wire rod supply nozzle becomes easy, and the degree of freedom in design is improved.

  Next, in this fixed state, the wire rod supply nozzle is brought into the slot portion 2 and a wire rod such as a copper wire is wound around the stator teeth portion 3a based on a predetermined program. The wire is wound and the winding is completed.

  In addition, with the configuration as described above, the wiring can be accurately wound, the laminated core shift and the resulting core floating are prevented, the electrical characteristics are good, the assembly trouble is small, and the core is divided. Even so, an electric motor stator core with improved productivity can be obtained.

In the above description, the assembly groove portion 4 has been described as a trapezoidal shape in consideration of productivity. However, substantially the same terms can be obtained with a drum shape or a drum shape.
That is, if both sides 4a of the assembly groove portion 4 are at least widened, as described above, the chucking of the stator core 1 at the time of winding is ensured and cannot be removed. Can be improved.

  Also, at this time, as shown in FIG. 4, the angle relaxation side 4b is provided at the tip end on the outer periphery side of the core back of the assembly groove both sides 4a, and the brightness between the sides 4a and the outer end surface of the core back 3b, that is, over If the angle of the hang part 6 is relaxed, a stator core having a shape that prevents friction and chipping of the mold forming the assembly groove part can be obtained.

  Furthermore, as shown in FIG. 4c, when the tip of the angle relaxation side 4b or the tip of the assembly groove part both sides 4a is rounded so as to be rounded, the mold wear and chipping are further prevented. Thus, a stator core can be obtained.

  At this time, as shown in FIG. 4d, substantially the same effect can be obtained even if the structure is such that the inner angle of the assembly groove portion 4 is an obtuse angle.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIGS. The second embodiment relates to the manufacture of the stator core of the electric motor in the first embodiment.

First, as shown in FIG. 5, a pilot hole 10a for determining the processing position is formed in the band-shaped silicon steel plate 10, and the core axial direction for separating the core backs 3b is separated using the pilot hole 10a as a proof. The side wall holes a for slits provided on the upper and lower sides and the concave portions as the hinge portions 7 for connecting the separated core backs 3b are processed corresponding to the core backs 3b, and caulking after the stator cores are laminated. The service hole c and the shaft hole d are punched out.
The pilot holes 10a, the slit side walls a, the recesses as the hinge portions 7, the caulking holes c, and the shaft holes may be processed simultaneously or separately.

Next, as shown in FIG. 6, slits for separating the core backs 3 b are inserted so as to connect the side walls for slits, and the end surfaces of the side walls of the core backs 3 b are formed.
At this time, as shown in FIG. 6, the core back separation processing of the odd-numbered layer stator core and the even-numbered layer stator core may be performed at the same time, or the odd-numbered layer processing (FIG. 6a) and the even-numbered processing. These processes (b in FIG. 6) may be divided and processed sequentially.
In addition, the slit shape is changed between the odd layer and the even layer as described above so that each divided stator core composed of each core back 3b and each tooth portion 3a can be rotated via the hinge portion 7 as described later. It is to do.

  Next, after the slit processing for separating the core back, as shown in FIG. 7, the clearance between teeth (gap groove) for separating the slot portion 2 and each tooth portion 3a is removed, and then hatching in the figure is performed. As shown in Fig. 5, the outer diameter of the stator core is contoured while separating the teeth from each other by machining a larger concentric hole on the shaft hole d, in other words, drilling so as to contact the gap groove. Form.

  Next, after this processing, an outer peripheral side end surface of the core back 3b and an overhang shape are formed continuously to the outer peripheral side end surface, and an assembly groove portion having a chucking function as a winding reference of the wire rod or a stacking reference of the core 4 is completed, that is, the outer diameter portion is contoured to complete the shape processing of the stator core plate.

  Next, after these series of shape processing, as shown in FIG. 9, the odd-numbered and even-numbered stator cores 1 are sequentially formed into a laminated mold having groove portions having substantially the same shape as the trapezoidal assembly groove portions 4. Lamination is performed with reference to the assembly groove portion 4, and after this lamination, the caulking holes c are crimped to complete the lamination of the stator core 1.

  At the time of lamination, the concave portion as the hinge portion 7 becomes a convex portion in the upper layer and becomes a concave portion in the lower layer so as to fit to each other to constitute a hinge function. Thus, each divided stator core composed of each core back 3b and each tooth portion 3a can be rotated.

  Further, when the outer diameter portion including the above-described trapezoidal assembly groove portion 4 is punched, there is a risk that the mold may be chipped or abnormally worn due to the overhanging shape as shown in FIG. Therefore, as shown in FIG. 10, when the slot processing of FIG. 7 is performed, the trapezoidal shape or the like of the assembly groove portion 4 is punched, and when the outer diameter contour punching processing of FIG. As shown in the figure, when processing the angle relaxation side for relaxing the angle of the overhang shape constituted by the outer peripheral side end surface of the core back 3b and both sides of the outer peripheral side end surface and the assembly groove portion 4, Since there is no punching process, the chipping and abnormal wear of the mold can be prevented.

It is a schematic plan view of the integral motor stator core in Embodiment 1 of this invention. 1 is a schematic plan view of a split motor stator core according to Embodiment 1 of the present invention. It is a schematic sectional fragmentary view of the stator core core after winding a wire around the electric motor stator teeth in the first embodiment of the present invention. It is a schematic groove shape figure of the various assembly groove parts of the stator core back in Embodiment 1 of this invention. It is a processing figure of the 1st process in Embodiment 2 of this invention. It is a processing figure of the 2nd, 3rd process in Embodiment 2 of this invention. It is a processing figure of the 4th and 5th process in Embodiment 2 of this invention. It is a processing figure of the 6th process in Embodiment 2 of this invention. It is a metal mold | die lamination | stacking figure of the stator core after the stator core process in Embodiment 2 of this invention. It is a process drawing of the assembly groove part when providing an angle relaxation side in both sides of the assembly groove part in Embodiment 2 of this invention. It is a processing figure of an angle relaxation side when the angle relaxation side is provided in both sides of the assembly groove part in Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Stator core, 2 Slot, 3 Magnetic pole piece, 3a Stator teeth, 3b Core back | bag, 4 Assembly groove part, 4a Both sides of assembly groove part, 5 Wire material, 6 Overhang part, 7 Hinge part

Claims (10)

Each T-shaped stator tooth around which a wire such as a copper wire is wound, and each core back that is continuously and integrally formed in each of the T-shaped lower portions of each stator tooth, and forms a magnetic flux path of the wire, In the status core, the assembly groove portion is provided on the outer side end surface of the core back so as to determine the position in the horizontal direction and the vertical direction of the stator teeth, and serves as a winding reference for the wire rod or a lamination reference for the core. A stator core for an electric motor having the following functions. 2. The stator core of the electric motor according to claim 1, wherein both sides of the assembly groove portion are provided so as to spread from an outer side end surface of the core back toward the stator teeth, and have a chucking function of the core back. . 3. The electric motor according to claim 2, wherein the assembly groove portion has a trapezoidal shape, and both ends of the assembly groove portion are formed such that an upper base of the trapezoid is located on an outer peripheral side end surface of the core back. Stator core. 4. The stator core for an electric motor according to claim 3, wherein an angle relaxation side is provided at a front end portion of both sides of the assembly groove portion to relax an angle formed by an outer peripheral side end surface of the core back and the both sides. 4. The stator core for an electric motor according to claim 3, wherein the assembly groove portion has a trapezoidal shape, and the angle relaxation side is formed as a straight side substantially perpendicular to the upper base of the trapezoid. The stator core of the electric motor according to claim 4 or 5, wherein a tip portion of the angle relaxation side or a tip portion of both sides of the assembly groove portion is rounded. The stator core for an electric motor according to any one of claims 2 to 6, wherein an inner angle of the assembly groove is formed as an obtuse angle. 2. Each core back has a structure in which each core back is divided, and a hinge portion is provided on each core back, and the core back is bent for each core back adjacent to each other. The stator core of the electric motor according to any one of 7 to 7. Each of the T-shaped stator teeth around which a wire such as a copper wire is wound, and each of the T-shaped lower portions of each of the stator teeth is continuously and integrally formed with each of the core backs. In the stator core divided into a plurality along the annular direction, the outer peripheral end surface and the overhang shape are formed continuously to the outer peripheral end surface of the core back while punching each T-shaped stator tooth from the band-shaped silicon steel plate, The manufacturing method of the stator core of the electric motor which processes the assembly groove part which functions as the winding reference | standard of the said wire, or the lamination | stacking reference | standard of the said core. Each of the T-shaped stator teeth around which a wire such as a copper wire is wound, and each of the T-shaped lower portions of each of the stator teeth is continuously and integrally formed with each of the core backs. In the stator core divided into a plurality along the annular direction, the outer peripheral end surface and the overhang shape are formed continuously to the outer peripheral end surface of the core back while punching out each T-shaped stator teeth from the band-shaped silicon steel sheet, A step of machining an assembly groove that functions as a wire winding reference or a core stacking reference, and an angle relaxation that relaxes the angle of the overhang formed on the outer peripheral side end surface of the core back and both sides of the assembly groove A method of manufacturing a stator core of an electric motor.

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